The incident took place Saturday afternoon in Fairfax County. Virginia State Police spokeswoman Corinne Geller said in a statement Sunday afternoon that the boy landed on a Ford Escape and the impact incapacitated the vehicle's driver.

The statement says the front-seat passenger steered the vehicle off the interstate and the car came to a stop on the left shoulder.

Geller says the driver of the Ford, 22-year-old Marisa W. Harris of Olney, Maryland, died at the scene. The front-seat passenger wasn't hurt.

The boy was taken to a local hospital for treatment of life-threatening injuries.

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